@article{Matthews2006,
author = {Matthews, S.H. and Sun, R.},
title= {Incidence of four-geneneration family lineages: Is timing of fertility or mortality a better explanation?},
year = {2006},
journal = {The Journals of Gerontology Series B: Psychological Sciences and Social Sciences},
volume = {61},
number = {2},
pages = {S99--S106},
}